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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea580b38cb65be54a54344c94e52b70140a0f4c40f004ac98d9e0f807b8ffb28' 
  AND token = 't+WBFlQM6Pzo+X91lWWrdjm38RPhlslJ8e+IQjWDoro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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