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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '295b9a4f0c4b2d89572f80e760da928e636493df10395d1f5a0f9d39a9de9635' 
  AND token = '7EyQW6wzrmOikxy1BEy6Z395OvE7xuMAUQyM+Jn/O3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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