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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef2cb0865a1f2bfc5f7976b8bf3af30accdf76b29e96fc8a11e81580566d6db3' 
  AND token = 'OHCxfMVWPBbEV+AnCd9JmDXsdwAM659RlgFCEGClyZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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