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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0a33ccb927a8ac02dcd65a75f8fb345d1084fbd6bf5484b4158891131f4aaca' 
  AND token = 'MMuohj/Uq2D9j5lIE5Im3SV8AKdtjIpc/cmQChbjoKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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