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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfa1370372b38dd43f814bc2c45d08f11b880042af829ff40bf13d96fac56dc2' 
  AND token = 'oDifHcQquHSI4mkJqmjRsomr2kObNzHnnJc6V+jXQDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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