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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d8081ee269a141985fe8118b2489fdbf8390e2855cbbbfad3c61203301f4301' 
  AND token = 'FB9FfJDbAeV26EIWr2DqBxi2Pu/f+H5AYQZ5gzwofpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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