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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '631e243e36a71bd0bdcd73a4cc69fb6c01be7406cd8d07fb487419a15f977977' 
  AND token = 'bs8uFj/k7eI2lH2I3SIRRt8oFSV9RiYv6k3cSHaOgZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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