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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8c361d354757b6709eca048e50a98f7ee3ec6feeeb35f32cd689a329fdab949' 
  AND token = 'wnXOprAWohwjxe4sr2CD6FcxXZyMlmOZJgm7X6hKg8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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