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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7ed939c8d841238a0d884566e98462b1d86ec4eff86a6a81b7f5101fc6e85b' 
  AND token = 'EP4dhT9DFgnzNfFAYwSqz6MQj54+Po8vT7hAQxsS+sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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