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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c90a536c24fedded0e82bbfb2a7055419024d34da994f43806b77b9a12401fb' 
  AND token = 'Opz5QQG1DZj6VE7NWhd+8AWOf3BEtBUCx9cNaSnqV2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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