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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dccad6c8a36038873c657b7d14a653a2e40361a513c51ea4bf3a0e8d49318e6' 
  AND token = 'e5b00TE1RurA7GZiNPIJet7QYSO44mXDY61qenQZdHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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