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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2490afbe0b973e1b2de0a20548d512bc800cd2a24674924ac4d5eb8269095df4' 
  AND token = 'IAIaXEn0TF6mBhsJ+lYk9Xn/6vtnzdoMu4DE6Huje/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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