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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e62389eda693defb1043c393bbf14dea50f6d7bc6570053b9cc63f3b03edea3e' 
  AND token = 'Tvpy9vFH9rVkDzfBA8m+CO8VoB2RouWtf24bdrZuz9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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