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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b8aad9ebb684b8a254513b5627be8c65be1c9ab7b2ff70c394e930c0cbe7315' 
  AND token = 'neH3plaxrnsP7nPF3scEUatparnQD2lxRoEvalf5/BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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