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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1642188f604056bc70e5d2495fb5bdac780e6c6e2958ce6c4ecee9fb9bc22eb8' 
  AND token = 'sUTtQc2xA314/cVFqC6A+u2mLQsQBNsprq/haNRvdzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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