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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83bd3780317daa7f6ecaf034aafb468aae9d81d62a43137fb79201734ad9ac4f' 
  AND token = 'I2+6u7A05/Z571qqPXK/NlhbMpcCIUuyzAzIfrG4NUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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