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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccd97ab952c74221ad6df97f3a0d3efc1f678fc5a2fb8d20433de56bc5b5adc8' 
  AND token = 'LKkTJoKz3DHdmt2RMhlqgTpO8N8nsLhhU6hgOsLgNbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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