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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebb308811c72593b6c4b3776125819f70ff555aa0f2a783bb70f9082d6a17aae' 
  AND token = 'Z1V0UBI/EvIpEUqouPjYUUAy2vfenXlav7YVif8rv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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