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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fcbf331e44974dca32f7066aef9e46b5fa7a0a7b81f19155d8f29bc81a1ccba' 
  AND token = 'gVU4F94h4zV7ojvl+ZPxjIBy+jBsftDF0abpifbokRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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