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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794607d9ad7eaed815445b37290d72bac9d3df0b4a24b5ccd059dfc6beef1ce3' 
  AND token = 'Io+WERXkDXMuPTS2vxZuy9F2yqtUfTgN7H/5Q/dXsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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