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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c939bcda8aed74fc22295d7a35acb6568117304eb7c53f5d571d81a1cb0fe3a9' 
  AND token = 'MtGfobkCuBq+RqNBEWOkbCskws5bBcV1rqoyRB0f3nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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