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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd7df7ab77ba35a5f88769a0ca3834a08b30df61f410ca76c76b3bf93c300cd6' 
  AND token = '8xNqpi4RGWfP2fERMaefXe6tXr1g7T2DxTS7yWowO0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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