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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd17976b0ec529625b9a8e8168d2d8f6b08416f1b46060d15a13b19cc3a08b05' 
  AND token = 'XZlEXF+twCNMMaHx9btS+Dh58+TZyMfRSl1AKSaLONs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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