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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd4b7e7eef236fe9b915c78bcd466f5a0639fcb37f60d5aeb3a2211aa066945b' 
  AND token = 'GgDCdCQDotT0bEO0rAhaXGl93PcViXc4z+4vjz8Cg7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}