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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd75e0b5d655c5acb074290721e64a6fa27aedb28586d40c61583b4bf598157fa' 
  AND token = '0IvmyuLgKrFyAsq7ruIl0Ru1xAvdd0OARDMriiT2or8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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