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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cb9b65fe8c89567611e609b7e4f27ddc88216cf2aa7d1d55762f9580d11a4e6' 
  AND token = 'YcQrfQjSRdaTTxkav/jC6FSixR15E70qlvrgTYGM9/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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