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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8927bbfde2367a51b503d3c501181c357e9822c38e55f4a8ea58e58e0157709d' 
  AND token = 'sonvpF0IcoiwHvB2KNu011TU7achhgnH7lSfS059c54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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