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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2098e9628a6083be0fa3bc851fb34b1f4af68b40f064a141ebad874e1e7481c0' 
  AND token = 'W2GC+LXxPUAHwSZFPLrSqCP2pDuPuCZs64AoF0TRU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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