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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd861fcfdf9dc2d02c84e2460a9547ee0733bd3917b1e256e73862adb07670aeb' 
  AND token = '1I5KvhLEpiNQdgipHd1vucPEpplmeQlvszxZeH+3nlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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