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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88b9a86af78bbe7cb122ea9f31591e34352df8a05b4f7f5664d8e7fbbdc2ed6d' 
  AND token = 'Xmna2VKPpyt9iaMAyCBMZ3lT9xJ+FhrMcAa7iG5lVzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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