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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e0bf58e67dd98935c3c24eb6fd0c13a92766316892d0a5b1f3684fa54da0ed5' 
  AND token = '6spR2ZdFpnT48pA2HdRZjnqTDLmfX+frfInFYkDulQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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