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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a526e1ccd599acf721a3c1ee59089f6f21017a060bfed632422eb97b1a10a2bb' 
  AND token = 'e8m8F8qhlaKF3gb5eX3SQGmRRIu+nokwOuVnRM/db3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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