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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a51aeeb6220c51c17ce1c641cc456073102c4e04308bf80a50bf59c999c64f29' 
  AND token = 'H8U/ajPsZTH3R4Dt0ohdp0al/h2rwk2xlmD/rNuRvo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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