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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b517bee2ecc256cd8b93be50b25cf61d6cce57fca9aed5bd77a78f0153cf58a' 
  AND token = 'HeeXz27uwR9EfP3CDSfMxOJntypbXVufwhCil9QD/Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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