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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f49b2b88a762ff66b2e82fe20cafcd47d1b1d286c90ac8b9f9fce948682c9f30' 
  AND token = 'fU2aNXserTgS1mi/4CURKUcgHKop95dseei8nzUnza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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