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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a4d4d4a1cc777b8533e1cb4809f5cab51718df2bf6c8204a7c8db533d677abd' 
  AND token = 'kvI6Qib0k+Nz9mJ0dR8Lkn+EyGeqsxe8yK1o9fTigW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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