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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd194219b11975d35b31989ae8909760bc581e5eb51ff9e8cabc6eace9d062bdb' 
  AND token = '3rdqD09afceKE1p5JZMQuas95qGp6Jd7L+Aee+1seUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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