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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2b3c1b813607431786285f71d84b3bd971f40bd80b8ad7084037bddb6d90eea' 
  AND token = '2el6hxG0b/NVVlM/SX79h/T7slomuFyvhXd7m5hiSIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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