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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ab9c7f868ef02d1c8663b886c7b0ab82bac7f337aa08aae89ddada551e7f0e' 
  AND token = 'T7QpVimsrNnqMkH/pZMpeSFBqxau9MhZbxQvDeKfx7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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