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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a902fb56f01c338014317ea4840a4ac9981a26f5536d2066e5c71992826ba6ab' 
  AND token = '4Pnyy+Z7cILosbP9l+3s1vX4QGdWd1dJmZ1NDe3U6xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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