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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e87d9db53f78bee43f533a096a5d77478e7cee40cd0237f93991dc159b1048' 
  AND token = 'ZGgvSN/TcB8Qj+ismJyDELMdyb3W9WoQBm2alhpmdF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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