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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5f9ec2afb970c3f543c771844357ea73420de8ff9a685cc474de16c83bf98a3' 
  AND token = 'MuH+IA49nEpzerbn0qvxkMpAdCWjwgRn6+JRhvFI9EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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