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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319494bf4068d7aa32fa924dc3827db7b218b4d7de030ded2837d79f8d15ec9a' 
  AND token = 'flEs4PorlP/ATUSyDKjaQRI6Ya19XYsjwRrW3MUm+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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