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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdcccf2dfddc0616108a25cb29d36420dae14b05f7d3134038e3f2b499d426fb' 
  AND token = '6J5+ykA40srlC3kE0xk8pWmdqLZVrwnFAPHh1XDVWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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