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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f519c1ce98592762ab1185217d35e45ce7929c268144e0b97dd58e56610abab' 
  AND token = 'WWeKU7wSvxqRXJaYy35IcA8dTydg0IIZcK+x8rB2Cjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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