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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6296352ac7fd895f7e405e611151939a6d99507a0e1c30d675de154b04ee0549' 
  AND token = 'O9Q4bV2JIRpe5SBN9P3SjuIVIriM7cCSRSEaHNp5Kb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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