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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '029ee14018d5f23e60bd69f42a0a3e0e6b059f99c99e16359d71350246105b7e' 
  AND token = 'Fll+9oNMp0YShHVR8wuWiSNQkIjU1fbXvj9LYufPBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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