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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82d6073bf9060533ef743189672b5961265294ce3302c4ae72f7ae8ab36a8ce2' 
  AND token = 'XJBE6Mwbi1EVywkyvxGehmdIeAT7SFoIuA9yky+6r1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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