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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c4cd5457fc8f299196627b87771ec5268786598cdc1e275e85c51305b045311' 
  AND token = 'go1O6VBPIIvg56v8bAnKopdMv1Mtk9sJgzM4eix5GP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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