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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef76f4e114c3a3e8ab7b1888280f0ef4de666f5c2108ea5b71c8ea6a5711aec7' 
  AND token = '6zusy93Zpo0y7/WGmhfVbxsrY4iaKpxk4KixFAk7UO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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