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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4132b0f3e79295264b1450c4061b7d8caa047bbec52156e75539a2e4d8a21cf2' 
  AND token = 'YwERFAmkN06ynBx/sl5m3ZTrL1vJddnU9vy9AHkzOTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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