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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d9a08ae243a27185b3f9492e2b08d096b2e7a239c130b48b3c2da7156f7c24b' 
  AND token = '53OXAW8eAoJizqcAvTYx7X5oNlexfPXrOPy2jo/my8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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