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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f6ecf4158e55703f47e0e1bebaed8590e9c58c0383d6b61ef0a2ccc321172ff' 
  AND token = 'DK57AbE41tn6TOe2LDNE7WRjaq802AilIZJjjHCKPa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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