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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e3b17afa2f9d196c10ddbdd0c1b6bf804e9fc9f269041e5b062ab5eeca064f' 
  AND token = 'EfvK+EfKqywwvzuxCqGt7TyaAHm5HUaTmP0Gyue8Z24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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