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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba8275e84afae7bbc1ff85ec2cf68a9594ae217a3d69bf3bc4ed062d13b4c94' 
  AND token = '1Z4cqiq4Ja3kCvrRj5/mrfCANdyX5rQbk/bMWDdtxhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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