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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '948ab81bade99aa9dfd4d206bfa734d45a0900b4de3d358c94be7378246c8546' 
  AND token = 'SfZvs1riQV7wS4IzQO5J56wJ4U9OFyAN2CQAYBrkH9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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